Deploy a Express app that uses Yarn

Q: How do I change the Yarn install command?

Run ezhst build set --install " ", then ezhst redeploy. Pass an empty string to return to auto-detection.

EasyHost picks Yarn when it finds yarn.lock. There is nothing to configure, and these are the exact commands it runs for Express.

Last updated November 9, 2026

What EasyHost runs

Step	Command
Lockfile	`yarn.lock`
Install	`corepack enable yarn && yarn install --frozen-lockfile`
Build	your package build script if you have one, for example `tsc`; skipped otherwise
Start	`scripts.start`, then `main`, `index.js` or `server.js`

Scripts run with yarn run <script>. Dev dependencies are available during the build, and the app runs with NODE_ENV=production.

Deploy

Listen on process.env.PORT and bind to 0.0.0.0.

npx ezhst projects create my-project --link
npx ezhst apps create my-app
npx ezhst link --project <project-slug> --app <app-slug>
npx ezhst env import .env
npx ezhst deploy

Things to watch with Yarn

Set packageManager in package.json to pin your Yarn version. Yarn Berry may need --immutable, which you can set with ezhst build set --install.

Commit yarn.lock. Without any lockfile, EasyHost falls back to npm install. To replace the install step, run ezhst build set --install "<command>".

Next steps

See the Express hub for every Express guide, or free Express hosting for what is included.

Frequently asked questions

How do I change the Yarn install command?

Run ezhst build set --install "<command>", then ezhst redeploy. Pass an empty string to return to auto-detection.

Start for free

Install the skill, choose Global or Local, then tell your agent to deploy. No credit card, no config files.

npx ezhst skill install